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ease}.sidebar-mobile-toggle:hover{background:var(--primary-bg)}.sidebar-overlay{display:none;position:fixed;inset:0;background:#0000004d;z-index:99;opacity:0;transition:opacity .3s ease}.sidebar-overlay.visible{opacity:1}@media(max-width:768px){.sidebar{transform:translate(-100%);box-shadow:var(--shadow-xl)}.sidebar.open{transform:translate(0)}.sidebar-mobile-toggle{display:flex}.sidebar-overlay{display:block}}.challenge-card{position:relative;background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:20px 20px 16px 28px;cursor:pointer;transition:transform .25s ease,box-shadow .25s ease;display:flex;flex-direction:column;overflow:hidden;animation:fadeIn .4s ease-out both}.challenge-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card-hover)}.challenge-card:focus-visible{outline:2px solid 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16px 60px}.notifications-topbar{flex-direction:column;gap:12px}.notification-item-time{display:none}}:root{--primary: #6C63FF;--primary-dark: #5A52E0;--primary-light: #8B85FF;--primary-bg: #F0EEFF;--gradient-cta: linear-gradient(135deg, #43E97B 0%, #38F9D7 100%);--gradient-cta-hover: linear-gradient(135deg, #38D96E 0%, #2DE8C6 100%);--gradient-purple: linear-gradient(135deg, #6C63FF 0%, #8B5CF6 50%, #7C3AED 100%);--gradient-auth: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--biology: #22C55E;--math: #3B82F6;--history: #F59E0B;--languages: #8B5CF6;--art: #EC4899;--chemistry: #06B6D4;--music: #F97316;--sports: #10B981;--bg: #F8F9FE;--bg-white: #FFFFFF;--bg-card: #FFFFFF;--bg-sidebar: #FAFBFF;--border: #E5E7EB;--border-light: #F3F4F6;--text-primary: #1F2937;--text-secondary: #6B7280;--text-muted: #9CA3AF;--text-white: #FFFFFF;--success: #22C55E;--warning: #F59E0B;--danger: #EF4444;--info: #3B82F6;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow: 0 1px 3px rgba(0, 0, 0, .1), 0 1px 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9999px;font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color:var(--text-primary);background-color:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;min-height:100vh}#root{min-height:100vh}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer;border:none;outline:none}input,textarea,select{font-family:inherit;font-size:.95rem}.loading-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;background:var(--bg)}.spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.fade-in{animation:fadeIn .4s ease-out}